EP 0535489 B1 19950621 - Process for the catalytic vapour phase oxidation of methacrolein to methacrylic acid.
Title (en)
Process for the catalytic vapour phase oxidation of methacrolein to methacrylic acid.
Title (de)
Verfahren zur katalytischen Gasphasenoxidation von Methacrolein zu Methacrylsäure.
Title (fr)
Procédé d'oxydation catalytique en phase gazeuse de la méthacroléine en acide méthacrylique.
Publication
Application
Priority
DE 4132684 A 19911001
Abstract (en)
[origin: US5231226A] A process for the catalytic gas-phase oxidation of methacrolein to methacrylic acid in a fixed-bed reactor with contacting tubes, at elevated temperature on catalytically active oxides with a conversion of methacrolein for a single pass of from 40 to 95 mol%, wherein the reaction temperature in the flow direction along the contacting tubes in a first reaction zone from entry of the starting reaction gases containing the reactants into the contacting tubes is from 280 to 340 DEG C. until a methacrolein conversion of from 20 to 40% is reached, and the reaction temperature is subsequently reduced by a total of from 5 DEG to 40 DEG C., abruptly or successively in steps or continuously along the contacting tubes until a methacrolein conversion of from 45 to 95% has been reached, with the proviso that the reaction temperature in this second reaction zone is not lower than 260 DEG C.
IPC 1-7
IPC 8 full level
C07C 51/235 (2006.01); B01J 27/186 (2006.01); B01J 27/188 (2006.01); B01J 27/19 (2006.01); B01J 27/195 (2006.01); B01J 27/199 (2006.01); C07C 51/25 (2006.01); C07C 57/04 (2006.01); C07C 57/055 (2006.01)
CPC (source: EP US)
C07C 51/252 (2013.01 - EP US)
C-Set (source: EP US)
Designated contracting state (EPC)
BE DE ES FR GB IT
DOCDB simple family (publication)
EP 0535489 A2 19930407; EP 0535489 A3 19930630; EP 0535489 B1 19950621; CZ 281911 B6 19970312; CZ 297492 A3 19930414; DE 4132684 A1 19930408; DE 59202609 D1 19950727; ES 2073223 T3 19950801; JP H05229985 A 19930907; US 5231226 A 19930727
DOCDB simple family (application)
EP 92116095 A 19920921; CS 297492 A 19920929; DE 4132684 A 19911001; DE 59202609 T 19920921; ES 92116095 T 19920921; JP 26126092 A 19920930; US 94842592 A 19920922